Continuous envelope form

ABSTRACT

A continuous forms press converts a roll of envelope paper into a continuous envelope form having a plurality of transverse perforated lines dividing the form into envelope blanks, a plurality of transverse score lines defining fold lines on the envelope blanks, longitudinal perforated lines and score lines defining side trim zones and side flaps, lines of sprocket holes along the side margins of the form, and adhesive coatings on a seal flap and adjacent side margins of a top sheet of each blank. The press folds the continuous form into a zigzag folded stack suitable for feeding into a computer printout device or automatic typewriter where the forms are automatically addressed from addresses contained in a tape or punch card memory. The continuous form is again folded into a zigzag stack and fed into a continuous forms envelope converter which includes means for separating the continuous form into separate envelope blanks, means for trimming the side trim zones from the blanks, means for folding over the side flaps, means for folding over a top sheet of each blank over a bottom sheet thereof along a transverse fold line, and means for activating the adhesive coatings adjacent the side margins of the top sheet and securing the side flaps thereto for completing the envelopes.

United States Patent Paul O. Wilson Severna Park, Md. (3132 Frederick Ave., Baltimore Md. 21229) Nov. 6, 1969 Division of Ser. No. 751.467. Aug. 9, 1968. [45] Patented Feb. 2, 1971 [72] Inventor 211 Appl. No 221 Filed [54] CONTINUOUS ENVELOPE FORM 5 Claims, 16 Drawing Figs.

Primary ExaminerDavid M. Bockenek Attorney-Raphael Semmes ABSTRACT: A continuous forms press converts a roll of envelope paper into a continuous envelope form having a plurality of transverse perforated lines dividing the form into envelope blanks, a plurality of transverse score lines defining fold lines on the envelope blanks, longitudinal perforated lines and score lines defining side trim zones and side flaps, lines of sprocket holes along the side margins of the form, and adhesive coatings on a seal flap and adjacent side margins of a top sheet of each blank. The press folds the continuous form into a zigzag folded stack suitable for feeding into a computer printout device or automatic typewriter where the fonns are automatically addressed from addresses contained in a tape or punch card memory. The continuous form is again folded into a zigzag stack and fed into a continuous forms envelope converter which includes means for separating the continuous form into separate envelope blanks, means for trimming the side trim zones from the blanks, means for folding over the side flaps, means for folding over a top sheet of each blank over a bottom sheet thereof along a transverse fold line, and means for activating the adhesive coatings adjacent the side margins of the top sheet and securing the side flaps thereto for completing the envelopes.

PATENTEU FEB 219m SHEET 2 OF 8 INVENTOR PAUL 0. WILSON ATTORNEY PATENTED FEB 2 an SHEET 3 0F 8 INVENTOR PAUL 0. WILSON ATTORNEY PATENTED FEB 2|97| SHEET h UF 8 vmN CNN OwN 0mm NON OON NON MON mm:

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ATTORNEY PATENIED FEB 2 |97| SHEET 8 [IF 8 INVENTOR PAUL 0. WILSON ATTORNEY CONTINUOUS ENVELOPE FORM This application is a division of my application Ser. No. 75 L467. filed Aug. 9, 1968, for Continuous Forms Envelope Converter System."

BACKGROUND OF THE INVENTION This invention relates to envelope making apparatus and, more specifically, to a system for converting a roll of envelope paper into a continuous form which is automatically addressed and which is converted into standard envelopes.

It is frequently necessary to mail envelopes stuffed with form letters, advertising material, circulars, or the like to a large number of addresses. Since the addressing of the envelopes manually from a mailing list is very time consuming, it has become the practice to employ automatic business machines within the memory of which the mailing list is stored for automatically preparing addressing labels for application to the envelopes. However, this practice requires that the labels be secured to the envelopes in an additional operation. It has also been suggested that addressing machines by employed having preaddressed plates which may be employed for printing in sequence directly upon the envelopes, but systems of this character require a great deal of storage space for the addressing plates and require special machinery for making the plates.

It it therefore desirable to provide a system in which envelopes may be addressed directly from automatic computerized typewriters which are programmed to print out addresses from a computer memory, and there have been a number of suggestions for addressing envelopes in this way. For example, it has been proposed that previously formed envelopes be adhesively secured to a continuous carrier strip of computer" paper having rows of sprocket holes adjacent its side margins so that it might be easily fed through automatic computerized printing equipment. However, this system requires that the envelopes be secured to and detached from the carrier strip which is then discarded. It has also been suggested that addresses be printed directly upon a continuous form which is provided with sprocket holes facilitate pin feeding into automatic printing equipment and which is converted into envelopes by laminating it to a second continuous strip. The resulting envelopes are unconventional, differing from the style of envelope customarily used in business practice, and are not adaptable for subsequent automatic stuffing and sealing operations.

SUMMARY OF THE INVENTION It is accordingly the principal object of the invention to provide an improved system for automatically addressing and forming envelopes for large scale mailings.

It is also an object of the invention to provide an envelope addressing system which provides addressed envelopes quickly and inexpensively, which eliminates costly addressing equipment, and which is substantially fully automated.

More specifically, it is an object of the invention to provide an envelope forming system which makes use of a continuous envelope form adapted to be fed through automatic computerized printing equipment to be preaddressed therein and which converts the continuous form into standard envelopes.

Another object of the invention is the provision of a continuous envelope form specially prepared for feeding through automatic computerized printing equipment and for conversion into standard envelopes.

An additional object is the provision of a continuous forms envelope converter for converting a continuous envelope form, which has been preaddressed in computerized printing equipment, into standard preaddressed envelopes.

It is a further object of the invention to provide a continuous forms envelope converter for converting a continuous envelope form of the aforementioned character into envelopes by separating it into individual envelope blanks, trimming excess material therefrom, folding over side flaps, folding the blank about a main fold line, and sealing the side flaps.

Additional objects include the provision of improved means for separating the envelope blanks, improved means for trimming the blanks of excess material, improved means for folding over the side flaps, improved means for folding the blank along the main fold line, and improved means for sea]- ing the side flaps.

Briefly, the invention contemplates a system for converting a continuous strip of paper into separate addressed envelopes. The system includes press means for providing perforated lines on the sheet transversely of the sheet to divide the strip into a plurality of envelope blanks, a pair of score lines transversely of each blank to provide a first main fold line between a bottom sheet and a top sheet and a second fold line between the top sheet and a seal flap, a pair of longitudinal lines spaced inwardly from the sides of the sheets to provide side margins, the longitudinal lines being score lines adjacent the bottom sheets to provide side flaps integral with the bottom sheets and perforated lines adjacent the top sheets to provide side trim zones, and a row of sprocket holes within each of the side margins. The press also include adhesive coater means for providing adhesive coatings on the seal flap and adjacent to the side margins of the top sheet. The strip is then folded into a continuous zigzag folded stack suitable for feeding into automatic computerized printing equipment. After the sheet is preaddressed in the automatic printing equipment, it is again folded into a zigzag folded stack and fed into a continuous forms envelope converter. The strip is intermittently fed to bring the transverse perforated lines beneath a cutter knife which is synchronized with the intermittent feed to separate the strip into envelope blanks. The blanks are then conveyed past side trimmers, which remove the side trim zones, and past side flap folders, which are positioned in the path of the side flaps. Side flap folders include wedge means for lifting the side flaps and spring means for folding over and flattening the side flaps. The envelope blanks are then fed into a guide chute wherein the forward edge engages stop means, causing the blank to buckle about the main fold line between the top sheet and the bottom sheet and be engaged by a pair of rollers and which complete the fold. The blank is then conveyed away from the guide chute past heaters which activate the adhesive coating to seal the side flaps to the top sheet. The completed envelopes are then received in a hopper or deposited on a conveyor which brings them to a station where they are stuffed and sealed.

The foregoing and other objects, advantages, and features of the invention and the manner in which the same are accomplished will become more readily apparent upon consideration of the following detailed description of the invention when taken in conjunction with the accompanying drawings, which illustrate preferred and exemplary embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a continuous forms envelope converter system of the invention;

FIG. 2 is a partial plan view of a continuous envelope form used in the system of the invention;

FIG. 3 is a partial plan view of another embodiment of a continuous envelope form used in the system of the invention;

FIG. 4 is a perspective view of a completed envelope of the invention;

FIG. 5 is a partial section view taken along the line 5-5 of FIG. 4;

FIG. 6 is a plan view of a continuous forms envelope converter of the invention;

FIG. 7 is a partial schematic side elevation view of the continuous forms envelope converter of FIG. 6',

FIG. 8 is a partial perspective view showing a detail of the continuous forms envelope converter of FIG. 6;

FIG. 9 is a partial side elevation view, partly in section, of a detail of the continuous forms envelope converter of FIG. 6;

FIG. 10 is a partial schematic side elevation view of the continuous forms envelope converter of FIG. 6;

FIG. 11 is a perspective view of a side flap fold-over mechanism of the continuous forms envelope converter of FIG. 6;

FIG. 12 is a plan view of the side flap fold-over mechanism.

FIG. 13 is a side elevational view of the side flap fold-over mechanism;

FIG. 14 is an end view of the side flap fold-over mechanism;

FIG. 15 is a schematic diagram illustrating the operation of the transverse fold-over mechanism of the continuous forms envelope converter of FIG. 6; and

FIG. 16 is an additional schematic diagram illustrating the operation of the transverse fold-over mechanism.

DETAILED DESCRIPTION Referring to FIG. 1, it will be seen that a continuous forms envelope converter system of the invention includes a rotary forms press 20 which converts a strip 22 of envelope paper stock from a roll 24 into a continuous envelope form 26, of the type shown in more detail in FIG 2 or FIG. 3, folded into a continuous zigzag folded stack 28. Since rotary forms press 20 comprises conventional apparatus, it is not described in detail herein. However, it is to be understood that this press applies score lines to the strip 22, punches sprocket holes therein along both edges, cuts perforations and diagonal cuts therein, applies adhesive coatings thereto, and prints thereon. Turning to FIG. 2, it will be seen that one embodiment of continuous envelope form 26 may include transverse perforated lines 30 extending from one side edge 32 to the other side edge 34 of the strip. These perforated lines 30 serve as lines of separation dividing the continuous envelope form into a plurality of individual envelope blanks 36, which will remain integral with the continuous form until separated as explained hereinafter, and are also utilized as the fold lines in zigzag folded stack 28. Strip 26 is provided with a pair of longitudinal lines of weakness and 42 spaced inwardly from side edges 32 and 34, respectively, to establish side margin portions 44 and 46. It will be noted that line 40 comprises alternating perforated lines 48 and score lines 50, and line 42 comprises corresponding perforated lines 52 and score lines 54. Additional perforated lines 56 extend across side margin portion 44 from the junctions 57 of perforated lines 48 and score lines 50. In the opposite side margin portion 46, corresponding perforated lines 58 extend from side margin 34 to the junctions 59 between perforated lines 52 and score lines 54. It will be observed that perforated line 30, perforated line 48, and perforated line 56 establish side trim zones 60, while perforated lines 30, 52, and 58 establish side trim zones 62.

Envelope blanks 36 are divided into a top sheet 64 and a bottom sheet 66 by means of a main transverse fold line established by a score line 68 forming a line of weakness extending between junctions 57 and 59. Top sheet 64 is provided with a second fold line established by a score line 70 providing a line of weakness to form a seal flap 72. It will be noted that score line 50 and 54 separate the bottom sheet 66 from the side margin portions 44 and 46 to form side flaps 74 and 76 integral with the bottom sheets 66. In order to finish the seal flap 72, diagonal slashes 78 and 80 are provided. So that the continuous envelope form may be pin-fed into conventional automated computerized printing equipment, two rows of sprocket holes 82 and 84 are provided in side margins 44 and 46. While it is not shown in the drawings, it is to be understood that appropriated printed matter may be printed on continuous form 26. For example, the press 20 may print a return address on each of the blanks 36.

Rotary forms press 20 also includes adhesive coater apparatus for applying heat-activatable adhesive coated areas on the continuous envelope form 26. It is to be understood, however, that these areas may be provided by running the form through a separate adhesive coating device. In any event, as will be observed from FIG. 2, an adhesive coated area 83 is provided on each of the seal flaps 72, and adhesive coated areas 85 and 86 are provided on top sheet 64 adjacent to perforated lines 48 and 52. As will be explained more fully hereinafter, coated areas 85 and 86 will cooperate with side flaps 74 and 76, respectively, for sealing the side flaps to the top sheet 64.

While FIG. 2 illustrates one embodiment of a continuous envelope form of the invention, it is to be understood that this form may be provided in other formats. For example, a second embodiment of a continuous envelope form is illustrated by continuous form 26' in FIG. 3. It will be noted that fonn 26' is in most respects substantially identical to continuous form 26 of FIG. 2, differing, however, in that the side margin portions 44 and 46' are of greater width and are divided by additional longitudinally extending perforated lines 88 and 90 to provide outer marginal areas 92 and 94 upon which are located the rows of sprocket holes 82 and 84. Thus, in this embodiment the side flaps 74 and 76' are free of sprocket holes. In all other respects, the form 26' is substantially identical to form 26 of FIG. 2; the primed reference numerals in FIG. 3 designate the same features as are designated by the corresponding unprimed reference numerals in FIG. 2.

Returning to FIG. '1, it will be noted that after continuous form 26 (or, in the case of the embodiment of FIG. 3, continuous forms 26') is formed into zigzag folded stack 28, it is pinfed into an address printer 100. The printer will be a printout device of conventional computer equipment or a pin-fed auto matic typewriter, which includes a memory in the form of prepunched cards or magnetic tape containing address information, and which is programmed to automatically print the addresses stored in the memory on the successive envelope blanks 36. Such equipment is readily adapted for quick and inexpensive correction or updating of the mailing list. Continuous form 26 is then refolded into zigzag stack 28. The continu ous form will now comprise a plurality of envelope blanks 36 each of which is preaddressed with a particular address as determined by the computer or automatic address printer 100.

The continuous envelope form 26 will not be in condition for conversion into individual preaddressed envelopes. This is accomplished in the continuous forms envelope converter 110. As shown in FIG. 1, the zigzag folded stack 28 is placed on a supply platform 1 12, and the continuous form 26 is fed by means which will be described more fully hereinafter into converter for separation by envelope separating means at location 114. The side trim zones 60 and 62 are removed by side trimming means at position 116. The side flaps 74 and 76 are folded over by side flap fold means 118. Next, the top sheet 64 is folded over the bottom sheet 66 by transverse fold-over means at 120. Finally, adhesive sealing means 122 causes adhesive coated areas 85 and 86 to adhere to side folds 74 and 76, respectively. The envelopes 124 which are now complete, are dropped upon a delivery table 126 and conveyed to a station where they may be manually or automatically stuffed and sealed ready for mailing.

Considering the continuous forms envelope converter 1ll0 in greater detail and referring initially to FIGS. 6 and 7, it will be observed that continuous form 26 is fed into envelope converter 110 by means of sprocket pins 128 which project from endless chains or belts through slots 129 provided between a pair of strip guide plates 131. The pins 128 and belt 130 are driven to advance continuous form 26 until transverse perforated lines 30 are directly beneath cutting means to be described more fully hereinafter, which will operate in synchronism therewith.

As shown in FIG. 1, envelope converter 110 includes a stand 132 which supports a main drive motor 134 having a drive pulley 136 driving a drive belt 138. Belt 138 is engaged with a main driven pulley 140 mounted on a main drive shaft 142. Referring to FIG. 7, it will be noted that main drive shaft 142 is coupled by means of a drive sprocket 144 and drive chain 146 with a driven sprocket 148 mounted on the same shaft 150 as a crank 152. Crank 152 is coupled to a crank arm 154 which, in turn, is coupled to a rack 156. Thus, rotation of crank 152 results in backward and forward reciprocation of rack 156, which is mounted to slide back and forth in suitable guide means (not shown). The rack 156 drives a pinion 158 which is mounted to rotate a shaft 160. This shaft 160 is coupled by means of an over-riding, or slip-clutch 161 to a drive drum 162 A drive sprocket 164 is mounted for rotation with drive drum 162 and drives a drive chain 166 which is engaged with a driver sprocket 168 to drive a shaft 170 upon which 18 also mounted a drive sprocket (not shown) for driving endless sprocket belt 130. Thus, reciprocation of rack 156 in the for ward direction (to the left in FIG. 7) causes movement of belt 130 in the direction designated by the arrow and feeds continuous form 26 by engagement of pins 128 with the rows of sprocket holes 82 and 84.

However, as already mentioned, it IS necessary that the drive of the continuous envelope form 26 be in one direction only and intermittent. The manner in which this is effected will now be explained. Drive drum 162 is provided with a V- groove or notch 172 (see FIGS. 7 and 9) )which upon full forward movement of rack 156 is brought into engagement with a spring detent 174 mounted on a detent supporting structure 176. As shown most clearly in FIG. 9, spring detent 174 may comprise a flat spring member 178 which is biased outwardly by a coil spring 180 received withina recess 182 in supporting structure 176. Drum 162 is also braked by means of a brake shoe 184 engaged with the outer surface thereof. It will be observed from FIG. 7 that brake shoe 184 is adjustably mounted on a screw member 186 extending through a supporting frame member 188. Thus, when rack 156 is reciprocated in the forward direction detent 174 is free to slide along the surface of the drive drum 162 permitting drive drum 162 to rotate in a clockwise direction, thus causing shaft 170 to rotate in the same direction and move endless sprocket belt 130 in a direction to feed continuous form 26 into the envelope converter l 10. However, when detent 174 reaches groove 172 de tent spring member" 178 falls into groove 172 preventing reverse rotation of drum 162 by virtue of the over-riding clutch action previously mentioned. Hence, as rack 156 reciprocates in the backward direction (to the right in FIG. 7), drum 162 is maintained stationary by detent 174 and brake shoe 184, which serves to maintain drive belt 130 stationary. It is to be understood that when drive belt 130 is thus brought to a stop, it will have moved continuous form 26 to such a position that a transverse perforated line 30 will be positioned directly beneath a cutting knife 190 mounted on a knife bar 192. As will be presently explained, knife 190 will vertically reciprocate in synchronism with the drive of continuous envelope form 26 so that it will strike the form along a transverse perforated line 30, when form 26 has been brought to a stop therebeneath.

Referring to FIGS. 7 and 8, it will be noted that an eccentric assembly 193 is provided near one end of knife bar 192 and includes an eccentric 194 mounted for rotation on drive shaft 142. Eccentric 194 rotates within an eccentric housing 196 causing vertical reciprocation of an eccentric arm 198 secured thereto as indicated by. the arrow in FIG. 8. As will be noted from FIGS. 6 and 8, the knife supporting structure includes vertical slide members 200 which vertically reciprocate in slides 202 mounted on side frame members 203. The knife supporting structure also includes a bottom bar 204 to which eccentric arm 198 is secured. Although only a single eccentric assembly 193 is shown in FIG. 8, it is to be understood that a second identical eccentric assembly is provided on drive shaft 142 near the opposite end of bottom bar 204. The eccentric assemblies are designed to reciprocate knife 190 in synchronism with the intermittent feed of continuous form 26, bringing knife 190 into cutting engagement with a transverse perforated line 30 when it is stationary and directly below the knife. It will be noted that continuous form 26 is supported by web supporting plates 206 until it is brought over a knife anvil 208 located beneath knife 190. When knife 190 strikes against continuous form 26 along a line 30, the opposite side of continuous form 26 is supported by knife anvil 208.

At this point, the continuous envelope form 26 is separated into separate envelope blanks 36. It is now necessary to convey the separated blanks 36 to side trim removal station 116. To this end, a series of lower conveyor belts 210 are provided. As shown in FIG. 7, these belts are driven by a lower belt drive roller 212 which is driven by means of a drive sprocket (not shown) on main drive shaft 142 through drive chain 214 and driven sprocket 216 mounted on the same shaft 218 as drive roller 212. When continuous form 26 is brought to a stop by means of the intermittent drive of belt 130, a forward edge will extend over driving belts 210. Thus, after knife 190 severs a blank 36 from continuous form 26, it will be conveyed forward by belts 210.

Referring to FIG. 10 which shows the continuous envelope converter beginning at drive roller 212, it will be seen that lower drive belts 210 are supported by a web supporting plate 220. are tensioned by a tension roller 211, and rotate lower belt rollers 318 (see FIGS. 15 and 16) mounted on a shaft 222. A gear 224 is mounted on shaft 222 and drives a gear 226 mounted on the same shaft 228 as upper belt rollers 322 (see FIGS. 15 and 16). A series of upper drive belts 230 extend about rollers 322 and a knurled roller 232 above roller 212. A tension bar 234, which is pivotally mounted on a pair of tension arms 236, bears against drive belts 230 pressing them against belts 210. In addition, pressure rollers 238 are mounted on pressure roller arms 240 pivotally mounted on a shaft 242 and engage against belts 230 pressing them against belts 210. An additional set of pressure rollers 244 are mounted on a shaft 246 extending between a pair of arms 248 pivotally mounted on side frame members 250.

The side trim removal mechanism at station 1 16 will now be described. This mechanism comprises a separate drive motor 252 mounted on a support platform 254 and having a drive shaft 256 for driving a timing belt 258. Timing belt 258 serves to drive a pair of knurled rollers 260 which are positioned beneath openings through web supporting support plate 220 as shown in FIG. 6. The knurled rollers 260 are mounted on the same shaft 264 as a drive pulley 262 coupled to timing belt 258. A metal pressure strip 266 is provided for each knurled roller. These strips are mounted by clamps 257 to shaft 242 and extend downwardly through the openings in web support plate 220 to press against knurled rollers 260. As an envelope blank is conveyed to side trim removal station 116, pressure strips 266 press downwardly on the side marginal portions 44 and 46 of the blanks causing the side trim zones 60 and 62 to tear away from the main portion of blanks 36. A pair of nipper rollers 268 engage knurled rollers 260 just below pressure strips 266 to snap the side trim zones away from the envelope blanks. However, side flaps 74 and 76 are not separated from the blanks. When the continuous envelope form 26' of FIG. 3 is utilized, the outer marginal areas 92 and 94 will be separated from the form along with side trim zones 60 and 62.

The envelope blanks 36 are now conveyed by belts 210 and 230 to side flap fold station 118. The folding over of the side flaps 74 and 76 is effected by a pair of side fold mechanisms 270 which are shown most clearly in FIGS. 11, 12, 13 and 14. It will be noted that the side fold mechanism includes a wedge block 280 having a tip portion 282 which faces in the direction from which the envelope blanks are conveyed. This tip portion 282 is positioned in the path of the side flaps and includes a first vertical surface 284 which is inclined inwardly of the envelope blank. The wedge block 280 also includes a second vertically inclined surface 286 and an intermediate surface 288 joining surfaces 284 and 286, which surface 288 is inclined both laterally and upwardly. The remainder 290 of the wedge block 280 is of generally rectangular shape. In FIG. 14, the wedge block is seen as viewed from the direction from which the envelope blanks are conveyed. When side flaps 74 and 76 engage with wedge block 280 they are lifted upwardly by surface 286 and inwardly by surfaces 288 and 284 until they are perpendicular to the horizontal. A vertical guide plate 292 is mounted on block 280 and is spaced a short distance inwardly of wedge block 280 to serve as a guide for the now vertical side flaps.

It is now necessary to fold over the vertical side flaps, and this is accomplished by means of a spring foldover member 294 which has a pair of legs 296 and 298 received in openings at the end of rectangular portion 290 of wedge blocks 280. It

will be observed that upper leg 296 of spring member 294 mcludes an inclined portion 300 which. as 15 most clearly shown in FIG. 13, extends downwardly and inwardly terminating in a flat loop portion 302 pressing against web support plate 220 As the vertical side flaps engage against inclined portion 300, they are gradually folded over until they are pressed flat by the flat loop portion 302.

The envelope blanks 36 are now ready to be folded over the main transverse fold line established by score line 68. In order to accomplish this, they are fed forwardly into a guide chute 304. This chute is made of sheet metal and includes an upper metal plate portion 306 and a lower metal plate portion 308 which are spaced apart a distance to receive the envelope blank therebetween and which are mounted on a support bar 309. It will be noted from FIG. 10 that upper plate 306 has its end 310 curled upwardly so that the envelope blanks may be easily received, while the lower end 311 of lower plate 308 is positioned closely adjacent to a roller 314 (see FIGS. and 16) to prevent inadvertent feeding of the envelope blanks between lower plate 308 and roller 314. As is most clearly shown in FIG. 6, guide chute 304 is provided with a plurality of slots 312 within which are received adjustable stop members 315 provided with thumb screws 316 for clamping them in a selected position.

As the envelope blank is received in chute 304 between top plate 306 and bottom plate 308, the forward end thereof strikes against the stops 315. These stops are so positioned that the main score line 68 of envelope blank will now be positioned above the gap between rollers 314 and 318. Roller 314 is mounted on a shaft 320 on which is mounted a gear 321 engaged with gear 224 so that rollers 318 and 314 rotate in opposite directions. Referring to FIGS. 15 and 16, in which the spacing between rollers 314 and 318 is exaggerated, it will be noted that when blank 36 engages against stop 315, it is caused to buckle along score line 68 and be received between roller 314 and belts 210 on rollers 318 which complete the fold and draw the blank 36 downwardly out of chute 304.

Again referring to FIG. 10, the envelope blank 36, which now has bottom sheet 68 folded over top sheet 64 with side flaps 74 and 76 respectively engaged with adhesive areas 85 and 86, is now conveyed past adhesive securing station 122 which includes electrical heaters 330. These heaters, as is seen in FIG. 6, are of cylindrical shape and, as is evident from FIG. 10, are vertically disposed along the path traversed by the now completely folded envelope blanks 36. Electric control boxes 332 supply heating current to the heaters. The envelope blanks are engaged against heaters 330 by means of spring strips 334 which are mounted on a shaft 335. The heat supplied by heaters 330 activates the heat activatable adhesive coatings 85 and 86 and cause the side flaps 74 and 76 to adhere thereto. Sealing pressure is provided by a pair of rollers driven by gears 336 and 338. Gear 336 is driven by a timing belt 340 coupled to a gear (not shown) mounted on shaft .222, and gear 336 is engaged with gear 338. In order to apply pressure to these rollers, spring means 341 may be provided.

The envelopes 124 are now completed and drop upon delivery conveyor 126 as shown in FIG. 1. The completed envelope 124 is shown in FIGS. 4 and 5. Bottom sheet 66 is folded over top sheet 64 with one of the side flaps 74 folded over bottom sheet 66 and adhesively secured to top sheet 64.

The other side flap (not shown in FIG. 5) will similarly be adhesively secured to top sheet 64.

The dimensions of the envelope, which will be recognized as being of standard style. are determined by the distances between transverse lines 30 and between longitudinal lines 40 and 42. When an envelope of different size is to be used, it may be necessary to adjust the spacing of sprocket belts 130, the timing of eccentric assembly 193. the location of pressure strips 266, the location of side fold mechanisms 270 and the position of stops 315. If the continuous envelope form of FIG. 3 is used, the continuous envelope converter may also be suitabl modified to receive the form 26.

Whr e preferred embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that changes can be made without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.

I claim:

1. A continuous envelope form for use with envelopes addressing equipment and convertible into envelopes in a continuous forms envelope converter, said form comprising a continuous strip of paper having perforated lines extending transversely of said strip to divide said strip into a plurality of envelope blanks, a pair of score lines extending transversely of each blank to provide a first fold line between a bottom sheet and a top sheet and a second fold line between said top sheet and a seal flap, a pair of longitudinal lines spaced inwardly from the sides of said strip to provide side margins, said longitudinal lines being score lines adjacent to said bottom sheet to provide side flaps integral with said bottom sheet and perforated lines adjacent to said top sheet to provide side trim zones, a row of sprocket holes in each of said side margins, and adhesive coatings on said seal flap and on said top sheet adjacent to the sides thereof.

2. A continuous envelope form as recited in claim 1, wherein said form is zigzag folded into a stack about said transverse perforated lines.

3. A continuous envelope form as recited in claim 1, further comprising an additional longitudinal perforated line in each side margin to define outer marginal strips, said sprocket holes being located on said marginal outer strips.

4. A continuous envelope form as recited in claim 1, further comprising diagonal slashes between the ends of said second fold lines and said transverse perforated lines.

5. A continuous envelope form for use with envelope addressing equipment and convertible into envelopes in a continuous forms envelope converter, said form comprising a continuous strip of paper having lines of separation extending transversely of said strip along which said strip is to be divided by said converter into a plurality of envelope blanks, a pair of lines of weakness extending transversely of each blank to provide a first fold line between a bottom sheet and a top sheet and a second fold line between said top sheet and a seal flap, a pair of longitudinal lines spaced inwardly from the sides of said strip to provide side margins, said longitudinal lines being lines of weakness adjacent to said bottom sheet to provide side flaps integral with said bottom sheet and defining side trim zones adjacent said top sheet, a row of sprocket holes in each of said side margins, and adhesive coatings on said seal flap and on said top sheet adjacent to the sides thereof. 

1. A continuous envelope form for use with envelopes addressing equipment and convertible into envelopes in a continuous forms envelope converter, said form comprising a continuous strip of paper having perforated lines extending transversely of said strip to divide said strip into a plurality of Envelope blanks, a pair of score lines extending transversely of each blank to provide a first fold line between a bottom sheet and a top sheet and a second fold line between said top sheet and a seal flap, a pair of longitudinal lines spaced inwardly from the sides of said strip to provide side margins, said longitudinal lines being score lines adjacent to said bottom sheet to provide side flaps integral with said bottom sheet and perforated lines adjacent to said top sheet to provide side trim zones, a row of sprocket holes in each of said side margins, and adhesive coatings on said seal flap and on said top sheet adjacent to the sides thereof.
 2. A continuous envelope form as recited in claim 1, wherein said form is zigzag folded into a stack about said transverse perforated lines.
 3. A continuous envelope form as recited in claim 1, further comprising an additional longitudinal perforated line in each side margin to define outer marginal strips, said sprocket holes being located on said marginal outer strips.
 4. A continuous envelope form as recited in claim 1, further comprising diagonal slashes between the ends of said second fold lines and said transverse perforated lines.
 5. A continuous envelope form for use with envelope addressing equipment and convertible into envelopes in a continuous forms envelope converter, said form comprising a continuous strip of paper having lines of separation extending transversely of said strip along which said strip is to be divided by said converter into a plurality of envelope blanks, a pair of lines of weakness extending transversely of each blank to provide a first fold line between a bottom sheet and a top sheet and a second fold line between said top sheet and a seal flap, a pair of longitudinal lines spaced inwardly from the sides of said strip to provide side margins, said longitudinal lines being lines of weakness adjacent to said bottom sheet to provide side flaps integral with said bottom sheet and defining side trim zones adjacent said top sheet, a row of sprocket holes in each of said side margins, and adhesive coatings on said seal flap and on said top sheet adjacent to the sides thereof. 